isn't his backwards? the meter in your example, usually a state gate, is extremely high R so that little to no current flows into it.....thereby making both circuits ope (or floating) when the switch is open. closing the switch in your "PULL UP" diagram will actually allow current to flow to ground thereby "pulling down" the meter input to 0. Conversely, closing the switch in your "PULL DOWN" diagram will "pull up" the input to source voltage......